Quantum 2025 – wissenschaftliches Programm

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FRI: Friday Contributed Sessions

FRI 11: Quantum 2D-Moiré and Rhombohedral van-der-Waals Systems: Contributed Session to Symposium

FRI 11.1: Vortrag

Freitag, 12. September 2025, 10:45–11:00, ZHG104

Observation of Floquet states in graphene — •Marco Merboldt¹, Michael Schüler², David Schmitt¹, Jan Philipp Bange¹, Wiebke Bennecke¹, Karun Gadge³, Klaus Pierz⁴, Hans Werner Schumacher⁴, Davood Momeni⁴, Daniel Steil¹, Salvatore R. Manmana³, Michael Sentef⁵, Marcel Reutzel¹, and Stefan Mathias¹ — ¹Georg-August-Universität Göttingen, I. Physikalisches Institut, Germany — ²Department of Physics, University of Fribourg, Fribourg, Switzerland — ³Georg-August-Universität Göttingen, Institut für Theoretische Physik, Germany — ⁴Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ⁵Institute for Theoretical Physics, University of Bremen, Bremen, Germany

Floquet engineering – the coherent dressing of matter via time-periodic perturbations – is a mechanism to realize and control emergent phases in materials out of equilibrium. However, the broad applicability of Floquet engineering to quantum materials is in question, especially with respect to (semi-)metals and graphene in particular.

Here, we resolve this long-standing debate by using electronic structure measurements to provide direct spectroscopic evidence of Floquet effects in graphene [1]. We report light-matter-dressed Dirac bands by measuring the contribution of Floquet sidebands, Volkov sidebands, and their quantum path interference to graphene’s photoemission spectrum. Fully supported by experiment and theory, we demonstrate that Floquet engineering in graphene is possible.

[1] Merboldt et al., Nature Physics (2025)

Keywords: Ultrafast momentum microscopy; trARPES; Graphene; light-matter interaction; Floquet engineering